A reservoir for storing products at cryogenic temperatures is provided. The reservoir includes an insulated vacuum tank delimiting a storage volume having an open upper end. The reservoir includes a mobile lid for closing and opening the storage volume. The reservoir also includes a controlled actuating member mechanically connected to the lid in order to move the lid. The actuating member being able to move between a first position that places the lid in its position for closing the storage volume of the tank and a second position that places the lid in a position for opening the storage volume of the tank.
